Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0db441ffecc5222…

MALICIOUS

PDF

72.6 KB Created: 2021-06-27 08:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7beff2c1f68fb59f8764220c6f01441 SHA-1: 017db95fb99a2d74eacd87bdb1c481c7dbade383 SHA-256: b0db441ffecc52225170760bfb7d230ec774595913dab4075d91b7494d744d19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external links and the overall heuristic profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=words+that+rhyme+with+lion
    • http://wojno-stal.pl/pliki/file/27268925222.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907a501368c---lipinolovukufadaga.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/05c3f393ffd631545a6c83411726ca3c/romorexujemekikowopopul.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7889b5c1051601c395e9cf2ec29cdf3e/11241432886.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/vdoroheru0vk5quacu0g1mlr3e/62739588901.pdf
    • http://www.asslar.de/downloads/5962283689.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/43016fec36c8c72962c000cfa6876b64/12573644365.pdf
    • http://ytbozhuo.com/upload/file/211650397189.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd476861a9---31708075995.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8fc06f44---wuvijew.pdf
    • https://sinhadventure.com/uploads/file/tadapifixotofosibexes.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/dac17a01395ddc1f4b277d5903308d9b/56256095177.pdf
    • https://primer-spb.ru/files/files/duwarenerutawobub.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ee2771f899b23f51c8ae8894314b63e2/liromemitu.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4udl94q0brji38prp2um335tf9/8387807785.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789775529c3---35676949129.pdf
    • http://taxiluzern.ch/khurasan/userfiles/files/31243307570.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/34957575274.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/70739ad440595837785e47e17386342c/jiwizolewole.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210613_7537DFAB6CAE8ACF.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/710ed7df0a35f54f5494c5c02ddcdfc3/sezazamepemonujix.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/divosowavimaba.pdf
    • http://domusanna.it/userfiles/files/39903239534.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1fef31840---vesadinufelaza.pdf
    • https://kis-u.com/page_data/file/20210607160146.pdf
    • https://abofahed.com/userfiles/file/zoliboxijok.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc1f.bin
cff0cad5bb26a9934f61e345727830d1f466cd02d052dabe10808be6a030e7bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1F 15612 bytes
font_01_sfnt_off0000e477.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 16792 bytes
font_02_sfnt_off0000fc8e.bin
8eec0c574d3b68248206b09f811700ff13d334cae9bb95cc285aa138757b56b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 10704 bytes